Chapter 12-24

Question 1

Troubleshooting tools

Answer 1

Logging
ICMP - ping traceroute
Telnet/ssh
Show ip arp 
Show ip interface brief

Question 2

How do you verify logging

Answer 2

Show logging

Question 3

Destination for logging

Answer 3

Console
Monitor
Memory buffer

Question 4

Trouble shoot to test end to end io v4 connectivity

Answer 4

Ping
Trace route - shows all hops (where broke)
Telnet ssh - tells if you can get to dev
Show ip arp- show map of ip to mac
Show ip interface brief - net config of all devices

Question 5

Common switch media issues

Answer 5

Usually physical

Damaged wiring
New EMI sources introduced
Traffic patterns change
New equipment installed

Question 6

Common fiber issues

Answer 6

Microbends and macrobends
Splice losses
Dirty connectors

Question 7

How to use show interfaces to see if interface Dow

Answer 7

Fix damaged cabling and or connectors

Question 8

How use show interfaces for excessive noise

Answer 8

Will see traffic dropped. Or may see in output

Check cable length

Question 9

How use show interfaces for excessive collisions

Answer 9

Verify and fix duplex settings

Question 10

What can show interfaces show to aid troubleshooting

Answer 10

If interface status down
If excessive noise
If excessive collisions

Question 11

How troubleshoot port issues

Answer 11

Do show interface to confirm speed or duplex mismatch

Or can do sho run to get same info

Or if cdp enabled will get error there

Question 12

Common categories of issues causing failure on network

Answer 12

Hardware failure
Software failure
Config error

Question 13

Errors to note on show interfaces

Answer 13

Input errors
Output errors
CRc errors
Collisions